const fs = require("fs");

fs.readFile("./test/a.txt", (err, data) => {
    if (err) throw err;
    console.log(data.toString());

    fs.readFile("./test/b.txt", (err, data) => {
        if (err) throw err;
        console.log(data.toString());

        fs.readFile("./test/c.txt", (err, data) => {
            if (err) throw err;
            console.log(data.toString());
        });
    });
});



